Question

In order to create a screen shot, I am hiding a wpf window. The code looks like that.

      Hide();
      var fullScreenshot = _cropper.TakeFullScreenshot();
      Show();

Sometimes the Application is not hidden when the screen shot is taken. How can I can I identify, that the window is completely hidden?

Answer 1

I don’t know how the screenshot is taken but I suspect that the UI-Thread has not removed all the content and therefore the TakeFullScreenshot sees rests of your app.

I would try to wait until your app has done all necessary ui-work and then trigger the TakeFullScreenshot-operation.

Trigger the ScreenShot-Operation with the Dispatcher:

Hide();
Dispatcher.BeginInvoke(new Action(delegate { 
    fullScreenshot = _cropper.TakeFullScreenshot(); 
    Show();
    }), System.Windows.Threading.DispatcherPriority.ContextIdle, null);